Abstract: The ideal design for a fan with variable performance that can replace a family of current axial flow ducted, un-ducted, and centrifugal fan designs by meeting air flow and pressure requirements while drawing less electric current to rotate and thus produce the required flow not only would reduce cost of operation over the life of the fan but opens new possibilities for direct connection to solar collection systems by greatly extending the life of the battery charge employed by the designer of the collection system. In addition the entry of flying machines using pairs of lifting fans such as hover bikes and quadcopters, manned or unmanned is driving a need to re-examine the application of force applied to rotate these fans to achieve a reduction in aircraft weight and increase flying time for a given battery charge or load of fuel.